2012 Peterbilt 386 - Extremely bouncy

Hello,

This truck is so bouncy over bumps that it caused bolts on the transmission to become loose as well as engine mounts to break. All shocks have been replaced on the front and rear of the truck. Problem still persists, and was actually worse after the shocks were replaced. Had peterbilt check ride height and they said it's perfect. I'm lost. Any ideas?

 

Sleeper. 3 axle. 53ft utility reefer trailer. Empty or loaded, doesn't matter. It's bouncy while going down the road. It's extremely harsh, you feel like your stomach is in your mouth over each bump. Tire pressures are all at 110 cold.

 

The fifth wheel is centered.

 

Like I said, ride height was checked by peterbilt and I was told it was perfect. Shocks were all replaced a month ago. It actually seemed worse after the shocks were replaced.

 

Yep. No different.